You've heard of culture clashes? The one in "The Colonel" ranks extreme. What happens when two visitors from North America come to pay a call at the home of a high ranking Salvadoran warlord? What's said can be less important than what's not said. And the disjuncture can't be chalked up only to language differences. How things are heard—and by whom or what—adds another disturbing layer to the horror story that this poem is recounting.
It's not you; it's him. The colonel says what he does and acts as a message to the United States.
Put on your beret and your V for Vendetta masks. A poem is one of the strongest modes of protest.